Britain's Chancellor of the Exchequer George Osborne (L) is shown how to lay a brick by bricklaying supervisor Michael Hull during a visit to a housing development in South Ockendon in Essex, Britain November 26, 2015.
Reuters
And how did it do this? This is how (emphasis ours):

In 2015, total home completions increased by 7% to 13,341, including our share of joint venture completions (2014: 12,454).

In other words, profit jumped because the number of properties it sold in more affluent locations. Yes, it did build more affordable houses in the UK, but they only account for 19% of new homes. Eighty-one percent of the houses it built were in more pricey areas.

To be clear, this isn't just Taylor Wimpey. It is perfectly normal across the entire UK house building industry.

For example, take a look at this Barratts' chart published in November 2015. The number of affordable housing builds brings in a lot less cash than private builds. It is in a company's interest to focus on properties that carry the highest market value:

Barratts

As Barclays pointed out in its recent UK housing report, "there is a strong relationship between share prices of house builders and the RICS survey of house price expectations."

So, it is predictable that selling houses that correspond more with general house prices, which show a soaring pace of growth, rather than affordable housing, is more lucrative for a company and its shareholders.

Here is a chart that shows the Royal Institution of Chartered Surveyors price survey vs. the share prices of builders:

Barclays/Datastream

The government benefits too. The more expensive homes are when they are sold, the more "stamp duty" is paid on the purchase price, which brings in more easy cash for the Treasury.

The following stamp duty rates are now applied to properties of certain selling prices:

0% — Up to £125,000.

2% — £125,001 to £250,000.

3% — £250,001 to £925,000.

10% — £925,001 to £1.5 million.

12% — Above £1.5 million.

Building properties over the threshold of £250,000 is a lot more lucrative for the companies as well as for the government's balance sheet.

That £250,000 level is almost 10 times the national annual wage of £27,000.

So there you have it — Britain is indeed building houses again. For rich people.